Himeko

Himeko is a Demon Slayer OC. She is easily confused, and doesn't even realize when she's become a demon. In her human life, she was a shrine maiden, and her favorite pasttime was stealing the offering bread as an early lunchtime snack. Muzan pays a visit to her shrine, and, believing him to be a kind individual, Himeko calls him Uncle when he visits. However, one day, he visits and slaughters the whole shrine, except for her. Himeko is transformed into a demon, yet has no recollection of the events that led up to that day, only waking up in a blood soaked room with her fallen shrine maiden sisters.